import {
	deepMerge,
	isUndefined
} from '../utils';

/**
 * 合并局部配置优先的配置，如果局部有该配置项则用局部，如果全局有该配置项则用全局
 * @param {Array} keys - 配置项
 * @param {Object} globalsConfig - 当前的全局配置
 * @param {Object} config2 - 局部配置
 * @return {{}}
 */
const mergeKeys = (keys, globalsConfig, config2) => {
	const config = {};
	keys.forEach((prop) => {
		if (!isUndefined(config2[prop])) {
			config[prop] = config2[prop];
		} else if (!isUndefined(globalsConfig[prop])) {
			config[prop] = globalsConfig[prop];
		}
	});
	return config;
};
/**
 *
 * @param globalsConfig - 当前实例的全局配置
 * @param config2 - 当前的局部配置
 * @return - 合并后的配置
 */
export default (globalsConfig, config2 = {}) => {
	const method = config2.method || globalsConfig.method || 'GET';
	let config = {
		baseURL: globalsConfig.baseURL || '',
		method: method,
		url: config2.url || '',
		params: config2.params || {},
		custom: {
			...(globalsConfig.custom || {}),
			...(config2.custom || {})
		},
		// @ts-ignore
		header: deepMerge(globalsConfig.header || {}, config2.header || {}),
	};
	const defaultToConfig2Keys = ['getTask', 'validateStatus'];
	config = {
		...config,
		...mergeKeys(defaultToConfig2Keys, globalsConfig, config2)
	};

	// eslint-disable-next-line no-empty
	if (method === 'DOWNLOAD') {
		// #ifdef H5 || APP-PLUS
		if (!isUndefined(config2.timeout)) {
			config['timeout'] = config2['timeout'];
		} else if (!isUndefined(globalsConfig.timeout)) {
			config['timeout'] = globalsConfig['timeout'];
		}
		// #endif
	} else if (method === 'UPLOAD') {
		if (config.header) {
			delete config.header['content-type'];
			delete config.header['Content-Type'];
		}
		const uploadKeys = [
			// #ifdef APP-PLUS || H5
			'files',
			// #endif
			// #ifdef MP-ALIPAY
			'fileType',
			// #endif
			// #ifdef H5
			'file',
			// #endif
			'filePath',
			'name',
			// #ifdef H5 || APP-PLUS
			'timeout',
			// #endif
			'formData',
		];
		uploadKeys.forEach((prop) => {
			if (!isUndefined(config2[prop])) {
				config[prop] = config2[prop];
			}
		});
		// #ifdef H5 || APP-PLUS
		if (isUndefined(config.timeout) && !isUndefined(globalsConfig.timeout)) {
			config['timeout'] = globalsConfig['timeout'];
		}
		// #endif
	} else {
		const defaultsKeys = [
			'data',
			// #ifdef H5 || APP-PLUS || MP-ALIPAY || MP-WEIXIN
			'timeout',
			// #endif
			'dataType',
			// #ifndef MP-ALIPAY
			'responseType',
			// #endif
			// #ifdef APP-PLUS
			'sslVerify',
			// #endif
			// #ifdef H5
			'withCredentials',
			// #endif
			// #ifdef APP-PLUS
			'firstIpv4',
			// #endif
		];
		config = {
			...config,
			...mergeKeys(defaultsKeys, globalsConfig, config2)
		};
	}

	return config;
};